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Verified answer
Integral Substitusi.∫ sec x cot² x dx
= ∫ (1 / cos x) (cos x / sin x)² dx
= ∫ (cos x / sin² x) dx
u = sin x
du / dx = cos x
= ∫ (cos x / u²) du / cos x
= ∫ u⁻² du
= -1/u + C
= -1 / sin x + C
= -csc x + C